Introduction:Do you think a hot Americano is just espresso with hot water added? In fact, water temperature plays a huge role in aroma release, acidity-sweetness balance, and overall flavor performance. This test used a medium-dark roasted blend as the base, preparing Americanos at 55°C, 65°C, 75°C, and 90°C, and evaluating them at three different time points to find the most suitable brewing temperatures for both dine-in and takeaway.
A hot Americano may seem like simply adding hot water to espresso, but temperature is actually a key factor — not only affecting aroma expression but also influencing the balance of acidity, sweetness, and bitterness, and even determining how long the coffee remains enjoyable. In this test, we used a medium-dark roasted blend as the base, brewing Americanos at four different temperatures: 55°C, 65°C, 75°C, and 90°C. We conducted three tastings — right after brewing, five minutes later, and twenty minutes later — to deeply analyze how different temperatures affect flavor and identify the optimal serving temperature.
Speaking of the origin of the Americano, it actually dates back to World War II. At the time, American soldiers were not accustomed to the strong flavor and small serving size of European espresso, so they asked the baristas to dilute it with water to make it closer to the drip coffee they were used to in the U.S. — and that’s how the “Americano” was born. This shows that an Americano is essentially a combination of espresso and water. A hot Americano is diluted with hot water, while an iced Americano is diluted with cold water. Though the principle is not complicated, the details in water temperature and ratio greatly impact the final flavor.
Many customers rarely consider that water temperature also matters when ordering a hot Americano, but it is actually one of the key factors affecting the overall performance of the coffee. Temperature not only changes extraction efficiency but also directly influences aroma release and taste perception. Therefore, we specifically tested hot Americanos under different temperature conditions, hoping to help coffee enthusiasts and professionals find the best preparation solutions.
This test used a medium-dark roasted blended coffee made from beans sourced from Brazil, Indonesia, and Vietnam — it’s the shop’s popular “Warm Sun Blend,” known for its rich, bold aroma and full-bodied crema, making it suitable for various espresso-based drinks, including Americanos and lattes. The coffee was brewed using a 1:4 coffee-to-water ratio, with 20 grams of coffee grounds extracted for about 30 seconds. The Galileo Q18 grinder was set to a 1.8 grind setting to ensure consistent grind size.
To simulate real drinking scenarios, we tasted the Americanos brewed at the four different temperatures at three different time points: immediately after brewing, five minutes later, and twenty minutes later, observing changes in aroma, acidity and sweetness, bitterness, and overall balance. The four cups of Americano were brewed at 55°C, 65°C, 75°C, and 90°C respectively, covering the typical temperature range used in most cafés.
Immediately after brewing, the 55°C and 65°C Americanos were cooler in temperature, offering a comfortable drinking experience and allowing clear perception of layered aromas from the blend — such as buttery cookies, chocolate, and subtle berry-like acidity. The overall profile was well-balanced with a clean aftertaste, though the 55°C cup suffered slightly due to cooler temperature, which limited aroma volatility. The 75°C Americano was initially too hot to drink comfortably but soon revealed intense aroma and rich mouthfeel, with notable sweetness and less pronounced acidity. As for the 90°C Americano, it was almost undrinkable right away due to the high temperature, with only some aroma detectable through smell, and the mouthfeel was relatively thin.
Five minutes later, the coffee temperatures had generally dropped by about 10°C. At this point, the 65°C and 75°C cups performed the best. The 65°C Americano had reached a pleasantly warm drinking temperature, with still-active aroma, distinct flavors, and good balance. The 75°C cup entered its optimal drinking window, showcasing rich, layered aroma, smooth mouthfeel, and a balanced combination of sweetness and body — its overall performance even surpassed that of the 65°C cup right after brewing. In contrast, the 55°C coffee had cooled to near room temperature, with noticeably weakened aroma and emerging bitterness. The 90°C coffee, though drinkable, still lagged behind in overall aroma and flavor expression.
By twenty minutes later, the aroma of all coffees had significantly faded. The 55°C coffee had completely cooled down, with a flavor profile similar to typical room-temperature coffee and the weakest overall flavor, making it the shortest-lasting option. The 65°C coffee had cooled to around 45°C and still retained relatively full flavor, performing better than the 55°C version. The 75°C coffee maintained a certain level of warmth at this point and was the only cup that still delivered good flavor and mouthfeel after twenty minutes. The 90°C coffee could now be consumed more easily, but its aroma had nearly disappeared, leaving a rather unremarkable drinking experience.
Based on overall performance, ranking the Americanos by their “immediately after brewing” quality gives the following order: 65°C > 75°C > 55°C > 90°C. When considering “overall flavor performance within twenty minutes,” the ranking is: 75°C > 65°C > 55°C > 90°C. This shows that while higher temperatures can deliver strong initial aroma stimulation, they can also cause discomfort due to heat and affect taste bud judgment, and rapid cooling significantly shortens the optimal drinking window. On the other hand, lower temperatures may feel comfortable upon drinking, but the coffee quickly loses heat and aroma, affecting the continuity of overall flavor.
Therefore, for hot Americanos intended for “dine-in” service, it is recommended to control the water temperature between75±5°C, as this range balances aroma release, mouthfeel, and ideal drinking temperature, allowing customers to enjoy the coffee at its best. Additionally, two practical tips are worth noting: First, always preheat the coffee cup before serving to prevent heat loss through the cup. Second, the above recommendations are primarily for dine-in situations. For takeaway or delivery orders, additional considerations must be made for temperature loss during transit. Adjusting water temperature or packaging methods is advised to ensure customers still receive a properly enjoyable drink.
The above content is compiled by CoffeeHunters, a coffee news website.
